| Message ID | 20210329015238.19474-4-quan@os.amperecomputing.com (mailing list archive) |
|---|---|
| State | Changes Requested |
| Headers | show |
| Series | Add Ampere's Altra SMPro hwmon driver | expand |
On 3/28/21 6:52 PM, Quan Nguyen wrote: > This commit adds support for Ampere SMpro hwmon driver. This driver > supports accessing various CPU sensors provided by the SMpro co-processor > including temperature, power, voltages, and current. > > Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com> > --- > drivers/hwmon/Kconfig | 8 + > drivers/hwmon/Makefile | 1 + > drivers/hwmon/smpro-hwmon.c | 494 ++++++++++++++++++++++++++++++++++++ > 3 files changed, 503 insertions(+) > create mode 100644 drivers/hwmon/smpro-hwmon.c > > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig > index 0ddc974b102e..ba4b5a911baf 100644 > --- a/drivers/hwmon/Kconfig > +++ b/drivers/hwmon/Kconfig > @@ -67,6 +67,14 @@ config SENSORS_ABITUGURU3 > This driver can also be built as a module. If so, the module > will be called abituguru3. > > +config SENSORS_SMPRO > + tristate "Ampere's Altra SMpro hardware monitoring driver" > + depends on MFD_SMPRO > + help > + If you say yes here you get support for the thermal, voltage, > + current and power sensors of Ampere's Altra processor family SoC > + with SMpro co-processor. > + > config SENSORS_AD7314 > tristate "Analog Devices AD7314 and compatibles" > depends on SPI > diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile > index 59e78bc212cf..b25391f9c651 100644 > --- a/drivers/hwmon/Makefile > +++ b/drivers/hwmon/Makefile > @@ -174,6 +174,7 @@ obj-$(CONFIG_SENSORS_SHT3x) += sht3x.o > obj-$(CONFIG_SENSORS_SHTC1) += shtc1.o > obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o > obj-$(CONFIG_SENSORS_SMM665) += smm665.o > +obj-$(CONFIG_SENSORS_SMPRO) += smpro-hwmon.o > obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o > obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o > obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o > diff --git a/drivers/hwmon/smpro-hwmon.c b/drivers/hwmon/smpro-hwmon.c > new file mode 100644 > index 000000000000..4277736ebc6e > --- /dev/null > +++ b/drivers/hwmon/smpro-hwmon.c > @@ -0,0 +1,494 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Ampere Computing SoC's SMPro Hardware Monitoring Driver > + * > + * Copyright (c) 2021, Ampere Computing LLC > + */ > +#include <linux/bitfield.h> > +#include <linux/hwmon.h> > +#include <linux/hwmon-sysfs.h> > +#include <linux/kernel.h> > +#include <linux/mod_devicetable.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/property.h> > +#include <linux/regmap.h> > + > +/* Identification Registers */ > +#define MANUFACTURER_ID_REG 0x02 > +#define AMPERE_MANUFACTURER_ID 0xCD3A > + > +/* Logical Power Sensor Registers */ > +#define SOC_TEMP_REG 0x10 > +#define SOC_VRD_TEMP_REG 0x11 > +#define DIMM_VRD_TEMP_REG 0x12 > +#define CORE_VRD_TEMP_REG 0x13 > +#define CH0_DIMM_TEMP_REG 0x14 > +#define CH1_DIMM_TEMP_REG 0x15 > +#define CH2_DIMM_TEMP_REG 0x16 > +#define CH3_DIMM_TEMP_REG 0x17 > +#define CH4_DIMM_TEMP_REG 0x18 > +#define CH5_DIMM_TEMP_REG 0x19 > +#define CH6_DIMM_TEMP_REG 0x1A > +#define CH7_DIMM_TEMP_REG 0x1B > +#define RCA_VRD_TEMP_REG 0x1C > + > +#define CORE_VRD_PWR_REG 0x20 > +#define SOC_PWR_REG 0x21 > +#define DIMM_VRD1_PWR_REG 0x22 > +#define DIMM_VRD2_PWR_REG 0x23 > +#define CORE_VRD_PWR_MW_REG 0x26 > +#define SOC_PWR_MW_REG 0x27 > +#define DIMM_VRD1_PWR_MW_REG 0x28 > +#define DIMM_VRD2_PWR_MW_REG 0x29 > +#define RCA_VRD_PWR_REG 0x2A > +#define RCA_VRD_PWR_MW_REG 0x2B > + > +#define MEM_HOT_THRESHOLD_REG 0x32 > +#define SOC_VR_HOT_THRESHOLD_REG 0x33 > +#define CORE_VRD_VOLT_REG 0x34 > +#define SOC_VRD_VOLT_REG 0x35 > +#define DIMM_VRD1_VOLT_REG 0x36 > +#define DIMM_VRD2_VOLT_REG 0x37 > +#define RCA_VRD_VOLT_REG 0x38 > + > +#define CORE_VRD_CURR_REG 0x39 > +#define SOC_VRD_CURR_REG 0x3A > +#define DIMM_VRD1_CURR_REG 0x3B > +#define DIMM_VRD2_CURR_REG 0x3C > +#define RCA_VRD_CURR_REG 0x3D > + > +struct smpro_hwmon { > + struct regmap *regmap; > +}; > + > +struct smpro_sensor { > + const u8 reg; > + const u8 reg_ext; > + const char *label; > +}; > + > +static const struct smpro_sensor temperature[] = { > + { > + .reg = SOC_TEMP_REG, > + .label = "temp1 SoC" > + }, > + { > + .reg = SOC_VRD_TEMP_REG, > + .label = "temp2 SoC VRD" > + }, > + { > + .reg = DIMM_VRD_TEMP_REG, > + .label = "temp3 DIMM VRD" > + }, > + { > + .reg = CORE_VRD_TEMP_REG, > + .label = "temp4 CORE VRD" > + }, > + { > + .reg = CH0_DIMM_TEMP_REG, > + .label = "temp5 CH0 DIMM" > + }, > + { > + .reg = CH1_DIMM_TEMP_REG, > + .label = "temp6 CH1 DIMM" > + }, > + { > + .reg = CH2_DIMM_TEMP_REG, > + .label = "temp7 CH2 DIMM" > + }, > + { > + .reg = CH3_DIMM_TEMP_REG, > + .label = "temp8 CH3 DIMM" > + }, > + { > + .reg = CH4_DIMM_TEMP_REG, > + .label = "temp9 CH4 DIMM" > + }, > + { > + .reg = CH5_DIMM_TEMP_REG, > + .label = "temp10 CH5 DIMM" > + }, > + { > + .reg = CH6_DIMM_TEMP_REG, > + .label = "temp11 CH6 DIMM" > + }, > + { > + .reg = CH7_DIMM_TEMP_REG, > + .label = "temp12 CH7 DIMM" > + }, > + { > + .reg = RCA_VRD_TEMP_REG, > + .label = "temp13 RCA VRD" > + }, > +}; > + > +static const struct smpro_sensor voltage[] = { > + { > + .reg = CORE_VRD_VOLT_REG, > + .label = "vout0 CORE VRD" > + }, > + { > + .reg = SOC_VRD_VOLT_REG, > + .label = "vout1 SoC VRD" > + }, > + { > + .reg = DIMM_VRD1_VOLT_REG, > + .label = "vout2 DIMM VRD1" > + }, > + { > + .reg = DIMM_VRD2_VOLT_REG, > + .label = "vout3 DIMM VRD2" > + }, > + { > + .reg = RCA_VRD_VOLT_REG, > + .label = "vout4 RCA VRD" > + }, > +}; > + > +static const struct smpro_sensor curr_sensor[] = { > + { > + .reg = CORE_VRD_CURR_REG, > + .label = "iout1 CORE VRD" > + }, > + { > + .reg = SOC_VRD_CURR_REG, > + .label = "iout2 SoC VRD" > + }, > + { > + .reg = DIMM_VRD1_CURR_REG, > + .label = "iout3 DIMM VRD1" > + }, > + { > + .reg = DIMM_VRD2_CURR_REG, > + .label = "iout4 DIMM VRD2" > + }, > + { > + .reg = RCA_VRD_CURR_REG, > + .label = "iout5 RCA VRD" > + }, > +}; > + > +static const struct smpro_sensor power[] = { > + { > + .reg = CORE_VRD_PWR_REG, > + .reg_ext = CORE_VRD_PWR_MW_REG, > + .label = "power1 CORE VRD" > + }, > + { > + .reg = SOC_PWR_REG, > + .reg_ext = SOC_PWR_MW_REG, > + .label = "power2 SoC" > + }, > + { > + .reg = DIMM_VRD1_PWR_REG, > + .reg_ext = DIMM_VRD1_PWR_MW_REG, > + .label = "power3 DIMM VRD1" > + }, > + { > + .reg = DIMM_VRD2_PWR_REG, > + .reg_ext = DIMM_VRD2_PWR_MW_REG, > + .label = "power4 DIMM VRD2" > + }, > + { > + .reg = RCA_VRD_PWR_REG, > + .reg_ext = RCA_VRD_PWR_MW_REG, > + .label = "power5 RCA VRD" > + }, > +}; > + > +static int smpro_read_temp(struct device *dev, u32 attr, int channel, long *val) > +{ > + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); > + unsigned int value; > + int ret; > + > + switch (attr) { > + case hwmon_temp_input: > + ret = regmap_read(hwmon->regmap, > + temperature[channel].reg, &value); > + if (ret) > + return ret; > + *val = (value & 0x1ff) * 1000; > + break; > + case hwmon_temp_crit: > + if (temperature[channel].reg == SOC_VRD_TEMP_REG) { > + ret = regmap_read(hwmon->regmap, SOC_VR_HOT_THRESHOLD_REG, &value); > + if (ret) > + return ret; > + *val = (value & 0x1ff) * 1000; > + } else { > + /* Report same MEM HOT threshold across DIMM channels */ > + ret = regmap_read(hwmon->regmap, MEM_HOT_THRESHOLD_REG, &value); > + if (ret) > + return ret; > + *val = (value & 0x1ff) * 1000; > + } To avoid code duplication: reg = temperature[channel].reg == SOC_VRD_TEMP_REG ? SOC_VR_HOT_THRESHOLD_REG : MEM_HOT_THRESHOLD_REG; ret = regmap_read(hwmon->regmap, reg, &value); if (ret) return ret; But then why don't you just use reg_ext to store SOC_VR_HOT_THRESHOLD_REG or MEM_HOT_THRESHOLD_REG ? It is already available, after all, and with it the code could be simplified to ret = regmap_read(hwmon->regmap, temperature[channel].reg_ext, &value); if (ret) return ret; I don't have a datasheet, but I do wonder what is in bit 9..15. Any idea ? Main question is if there is a sign bit, as theoretic as it may be. > + break; > + default: > + return -EOPNOTSUPP; > + } > + return 0; > +} > + > +static int smpro_read_in(struct device *dev, u32 attr, int channel, long *val) > +{ > + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); > + unsigned int value; > + int ret; > + > + switch (attr) { > + case hwmon_in_input: > + ret = regmap_read(hwmon->regmap, voltage[channel].reg, &value); > + if (ret < 0) > + return ret; > + /* Scale reported by the hardware is 1mV */ > + *val = value & 0x7fff; What is in bit 15 ? > + return 0; > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static int smpro_read_curr(struct device *dev, u32 attr, int channel, long *val) > +{ > + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); > + unsigned int value; > + int ret; > + > + switch (attr) { > + case hwmon_curr_input: > + ret = regmap_read(hwmon->regmap, curr_sensor[channel].reg, &value); > + if (ret < 0) > + return ret; > + /* Scale reported by the hardware is 1mA */ > + *val = value & 0x7fff; > + return 0; > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static int smpro_read_power(struct device *dev, u32 attr, int channel, long *val_pwr) > +{ > + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); > + unsigned int val = 0, val_mw = 0; > + int ret; > + > + switch (attr) { > + case hwmon_power_input: > + ret = regmap_read(hwmon->regmap, power[channel].reg, &val); > + if (ret) > + return ret; > + > + ret = regmap_read(hwmon->regmap, power[channel].reg_ext, &val_mw); > + if (ret) > + return ret; > + > + *val_pwr = val * 1000000 + val_mw * 1000; > + return 0; > + > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static int smpro_read(struct device *dev, enum hwmon_sensor_types type, > + u32 attr, int channel, long *val) > +{ > + switch (type) { > + case hwmon_temp: > + return smpro_read_temp(dev, attr, channel, val); > + case hwmon_in: > + return smpro_read_in(dev, attr, channel, val); > + case hwmon_power: > + return smpro_read_power(dev, attr, channel, val); > + case hwmon_curr: > + return smpro_read_curr(dev, attr, channel, val); > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static int smpro_write(struct device *dev, enum hwmon_sensor_types type, > + u32 attr, int channel, long val) > +{ > + return -EOPNOTSUPP; > +} There are no writeable attributes, thus the write function is not needed. > + > +static int smpro_read_string(struct device *dev, enum hwmon_sensor_types type, > + u32 attr, int channel, const char **str) > +{ > + switch (type) { > + case hwmon_temp: > + switch (attr) { > + case hwmon_temp_label: > + *str = temperature[channel].label; > + return 0; > + default: > + return -EOPNOTSUPP; > + } > + break; > + > + case hwmon_in: > + switch (attr) { > + case hwmon_in_label: > + *str = voltage[channel].label; > + return 0; > + default: > + return -EOPNOTSUPP; > + } > + break; > + > + case hwmon_curr: > + switch (attr) { > + case hwmon_curr_label: > + *str = curr_sensor[channel].label; > + return 0; > + default: > + return -EOPNOTSUPP; > + } > + break; > + > + case hwmon_power: > + switch (attr) { > + case hwmon_power_label: > + *str = power[channel].label; > + return 0; > + default: > + return -EOPNOTSUPP; > + } > + break; > + default: > + return -EOPNOTSUPP; > + } > + > + return -EOPNOTSUPP; If you are returning -ENOPSUPP by default, might as well replace all the same returns above with break; > +} > + > +static umode_t smpro_is_visible(const void *data, enum hwmon_sensor_types type, > + u32 attr, int channel) > +{ > + const struct smpro_hwmon *hwmon = data; > + unsigned int value; > + int ret; > + > + switch (type) { > + case hwmon_temp: > + switch (attr) { > + case hwmon_temp_input: > + case hwmon_temp_label: > + case hwmon_temp_crit: > + ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value); > + if (ret || value == 0xFFFF) > + return 0; > + break; > + } > + default: > + break; > + } > + > + return 0444; > +} > + > +static const struct hwmon_channel_info *smpro_info[] = { > + HWMON_CHANNEL_INFO(temp, > + HWMON_T_INPUT | HWMON_T_LABEL, > + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, > + HWMON_T_INPUT | HWMON_T_LABEL, > + HWMON_T_INPUT | HWMON_T_LABEL, > + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, > + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, > + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, > + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, > + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, > + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, > + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, > + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, > + HWMON_T_INPUT | HWMON_T_LABEL), > + HWMON_CHANNEL_INFO(in, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL), > + HWMON_CHANNEL_INFO(power, > + HWMON_P_INPUT | HWMON_P_LABEL, > + HWMON_P_INPUT | HWMON_P_LABEL, > + HWMON_P_INPUT | HWMON_P_LABEL, > + HWMON_P_INPUT | HWMON_P_LABEL, > + HWMON_P_INPUT | HWMON_P_LABEL), > + HWMON_CHANNEL_INFO(curr, > + HWMON_C_INPUT | HWMON_C_LABEL, > + HWMON_C_INPUT | HWMON_C_LABEL, > + HWMON_C_INPUT | HWMON_C_LABEL, > + HWMON_C_INPUT | HWMON_C_LABEL, > + HWMON_C_INPUT | HWMON_C_LABEL), > + NULL > +}; > + > +static const struct hwmon_ops smpro_hwmon_ops = { > + .is_visible = smpro_is_visible, > + .read = smpro_read, > + .write = smpro_write, > + .read_string = smpro_read_string, > +}; > + > +static const struct hwmon_chip_info smpro_chip_info = { > + .ops = &smpro_hwmon_ops, > + .info = smpro_info, > +}; > + > +static bool is_valid_id(struct regmap *regmap) > +{ > + unsigned int val; > + int ret; > + > + ret = regmap_read(regmap, MANUFACTURER_ID_REG, &val); > + > + return (ret || (val != AMPERE_MANUFACTURER_ID)) ? false : true; I am quite concerned about this: The calling code will translate it to -EPROBE_DEFER even if the manufacturer ID is wrong. It should return -ENODEV in that case. There should be a better means to determine if the controller is not available at all, or not yet. > +} > + > +static int smpro_hwmon_probe(struct platform_device *pdev) > +{ > + struct smpro_hwmon *hwmon; > + struct device *hwmon_dev; > + > + hwmon = devm_kzalloc(&pdev->dev, sizeof(struct smpro_hwmon), GFP_KERNEL); > + if (!hwmon) > + return -ENOMEM; > + > + hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL); > + if (!hwmon->regmap) > + return -ENODEV; > + > + /* Check for valid ID */ > + if (!is_valid_id(hwmon->regmap)) > + return -EPROBE_DEFER; > + > + hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "smpro_hwmon", > + hwmon, &smpro_chip_info, NULL); > + > + return PTR_ERR_OR_ZERO(hwmon_dev); > +} > + > +static const struct of_device_id smpro_hwmon_of_match[] = { > + { .compatible = "ampere,ac01-hwmon" }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, smpro_hwmon_of_match); > + > +static struct platform_driver smpro_hwmon_driver = { > + .probe = smpro_hwmon_probe, > + .driver = { > + .name = "smpro-hwmon", > + .of_match_table = smpro_hwmon_of_match, > + }, > +}; > + > +module_platform_driver(smpro_hwmon_driver); > + > +MODULE_AUTHOR("Thu Nguyen <thu@os.amperecomputing.com>"); > +MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>"); > +MODULE_DESCRIPTION("Ampere Altra SMPro hwmon driver"); > +MODULE_LICENSE("GPL v2"); >
On 30/03/2021 08:43, Guenter Roeck wrote: > On 3/28/21 6:52 PM, Quan Nguyen wrote: >> This commit adds support for Ampere SMpro hwmon driver. This driver >> supports accessing various CPU sensors provided by the SMpro co-processor >> including temperature, power, voltages, and current. >> >> Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com> >> --- >> drivers/hwmon/Kconfig | 8 + >> drivers/hwmon/Makefile | 1 + >> drivers/hwmon/smpro-hwmon.c | 494 ++++++++++++++++++++++++++++++++++++ >> 3 files changed, 503 insertions(+) >> create mode 100644 drivers/hwmon/smpro-hwmon.c >> >> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig >> index 0ddc974b102e..ba4b5a911baf 100644 >> --- a/drivers/hwmon/Kconfig >> +++ b/drivers/hwmon/Kconfig >> @@ -67,6 +67,14 @@ config SENSORS_ABITUGURU3 >> This driver can also be built as a module. If so, the module >> will be called abituguru3. >> >> +config SENSORS_SMPRO >> + tristate "Ampere's Altra SMpro hardware monitoring driver" >> + depends on MFD_SMPRO >> + help >> + If you say yes here you get support for the thermal, voltage, >> + current and power sensors of Ampere's Altra processor family SoC >> + with SMpro co-processor. >> + >> config SENSORS_AD7314 >> tristate "Analog Devices AD7314 and compatibles" >> depends on SPI >> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile >> index 59e78bc212cf..b25391f9c651 100644 >> --- a/drivers/hwmon/Makefile >> +++ b/drivers/hwmon/Makefile >> @@ -174,6 +174,7 @@ obj-$(CONFIG_SENSORS_SHT3x) += sht3x.o >> obj-$(CONFIG_SENSORS_SHTC1) += shtc1.o >> obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o >> obj-$(CONFIG_SENSORS_SMM665) += smm665.o >> +obj-$(CONFIG_SENSORS_SMPRO) += smpro-hwmon.o >> obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o >> obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o >> obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o >> diff --git a/drivers/hwmon/smpro-hwmon.c b/drivers/hwmon/smpro-hwmon.c >> new file mode 100644 >> index 000000000000..4277736ebc6e >> --- /dev/null >> +++ b/drivers/hwmon/smpro-hwmon.c >> @@ -0,0 +1,494 @@ >> +// SPDX-License-Identifier: GPL-2.0+ >> +/* >> + * Ampere Computing SoC's SMPro Hardware Monitoring Driver >> + * >> + * Copyright (c) 2021, Ampere Computing LLC >> + */ >> +#include <linux/bitfield.h> >> +#include <linux/hwmon.h> >> +#include <linux/hwmon-sysfs.h> >> +#include <linux/kernel.h> >> +#include <linux/mod_devicetable.h> >> +#include <linux/module.h> >> +#include <linux/platform_device.h> >> +#include <linux/property.h> >> +#include <linux/regmap.h> >> + >> +/* Identification Registers */ >> +#define MANUFACTURER_ID_REG 0x02 >> +#define AMPERE_MANUFACTURER_ID 0xCD3A >> + >> +/* Logical Power Sensor Registers */ >> +#define SOC_TEMP_REG 0x10 >> +#define SOC_VRD_TEMP_REG 0x11 >> +#define DIMM_VRD_TEMP_REG 0x12 >> +#define CORE_VRD_TEMP_REG 0x13 >> +#define CH0_DIMM_TEMP_REG 0x14 >> +#define CH1_DIMM_TEMP_REG 0x15 >> +#define CH2_DIMM_TEMP_REG 0x16 >> +#define CH3_DIMM_TEMP_REG 0x17 >> +#define CH4_DIMM_TEMP_REG 0x18 >> +#define CH5_DIMM_TEMP_REG 0x19 >> +#define CH6_DIMM_TEMP_REG 0x1A >> +#define CH7_DIMM_TEMP_REG 0x1B >> +#define RCA_VRD_TEMP_REG 0x1C >> + >> +#define CORE_VRD_PWR_REG 0x20 >> +#define SOC_PWR_REG 0x21 >> +#define DIMM_VRD1_PWR_REG 0x22 >> +#define DIMM_VRD2_PWR_REG 0x23 >> +#define CORE_VRD_PWR_MW_REG 0x26 >> +#define SOC_PWR_MW_REG 0x27 >> +#define DIMM_VRD1_PWR_MW_REG 0x28 >> +#define DIMM_VRD2_PWR_MW_REG 0x29 >> +#define RCA_VRD_PWR_REG 0x2A >> +#define RCA_VRD_PWR_MW_REG 0x2B >> + >> +#define MEM_HOT_THRESHOLD_REG 0x32 >> +#define SOC_VR_HOT_THRESHOLD_REG 0x33 >> +#define CORE_VRD_VOLT_REG 0x34 >> +#define SOC_VRD_VOLT_REG 0x35 >> +#define DIMM_VRD1_VOLT_REG 0x36 >> +#define DIMM_VRD2_VOLT_REG 0x37 >> +#define RCA_VRD_VOLT_REG 0x38 >> + >> +#define CORE_VRD_CURR_REG 0x39 >> +#define SOC_VRD_CURR_REG 0x3A >> +#define DIMM_VRD1_CURR_REG 0x3B >> +#define DIMM_VRD2_CURR_REG 0x3C >> +#define RCA_VRD_CURR_REG 0x3D >> + >> +struct smpro_hwmon { >> + struct regmap *regmap; >> +}; >> + >> +struct smpro_sensor { >> + const u8 reg; >> + const u8 reg_ext; >> + const char *label; >> +}; >> + >> +static const struct smpro_sensor temperature[] = { >> + { >> + .reg = SOC_TEMP_REG, >> + .label = "temp1 SoC" >> + }, >> + { >> + .reg = SOC_VRD_TEMP_REG, >> + .label = "temp2 SoC VRD" >> + }, >> + { >> + .reg = DIMM_VRD_TEMP_REG, >> + .label = "temp3 DIMM VRD" >> + }, >> + { >> + .reg = CORE_VRD_TEMP_REG, >> + .label = "temp4 CORE VRD" >> + }, >> + { >> + .reg = CH0_DIMM_TEMP_REG, >> + .label = "temp5 CH0 DIMM" >> + }, >> + { >> + .reg = CH1_DIMM_TEMP_REG, >> + .label = "temp6 CH1 DIMM" >> + }, >> + { >> + .reg = CH2_DIMM_TEMP_REG, >> + .label = "temp7 CH2 DIMM" >> + }, >> + { >> + .reg = CH3_DIMM_TEMP_REG, >> + .label = "temp8 CH3 DIMM" >> + }, >> + { >> + .reg = CH4_DIMM_TEMP_REG, >> + .label = "temp9 CH4 DIMM" >> + }, >> + { >> + .reg = CH5_DIMM_TEMP_REG, >> + .label = "temp10 CH5 DIMM" >> + }, >> + { >> + .reg = CH6_DIMM_TEMP_REG, >> + .label = "temp11 CH6 DIMM" >> + }, >> + { >> + .reg = CH7_DIMM_TEMP_REG, >> + .label = "temp12 CH7 DIMM" >> + }, >> + { >> + .reg = RCA_VRD_TEMP_REG, >> + .label = "temp13 RCA VRD" >> + }, >> +}; >> + >> +static const struct smpro_sensor voltage[] = { >> + { >> + .reg = CORE_VRD_VOLT_REG, >> + .label = "vout0 CORE VRD" >> + }, >> + { >> + .reg = SOC_VRD_VOLT_REG, >> + .label = "vout1 SoC VRD" >> + }, >> + { >> + .reg = DIMM_VRD1_VOLT_REG, >> + .label = "vout2 DIMM VRD1" >> + }, >> + { >> + .reg = DIMM_VRD2_VOLT_REG, >> + .label = "vout3 DIMM VRD2" >> + }, >> + { >> + .reg = RCA_VRD_VOLT_REG, >> + .label = "vout4 RCA VRD" >> + }, >> +}; >> + >> +static const struct smpro_sensor curr_sensor[] = { >> + { >> + .reg = CORE_VRD_CURR_REG, >> + .label = "iout1 CORE VRD" >> + }, >> + { >> + .reg = SOC_VRD_CURR_REG, >> + .label = "iout2 SoC VRD" >> + }, >> + { >> + .reg = DIMM_VRD1_CURR_REG, >> + .label = "iout3 DIMM VRD1" >> + }, >> + { >> + .reg = DIMM_VRD2_CURR_REG, >> + .label = "iout4 DIMM VRD2" >> + }, >> + { >> + .reg = RCA_VRD_CURR_REG, >> + .label = "iout5 RCA VRD" >> + }, >> +}; >> + >> +static const struct smpro_sensor power[] = { >> + { >> + .reg = CORE_VRD_PWR_REG, >> + .reg_ext = CORE_VRD_PWR_MW_REG, >> + .label = "power1 CORE VRD" >> + }, >> + { >> + .reg = SOC_PWR_REG, >> + .reg_ext = SOC_PWR_MW_REG, >> + .label = "power2 SoC" >> + }, >> + { >> + .reg = DIMM_VRD1_PWR_REG, >> + .reg_ext = DIMM_VRD1_PWR_MW_REG, >> + .label = "power3 DIMM VRD1" >> + }, >> + { >> + .reg = DIMM_VRD2_PWR_REG, >> + .reg_ext = DIMM_VRD2_PWR_MW_REG, >> + .label = "power4 DIMM VRD2" >> + }, >> + { >> + .reg = RCA_VRD_PWR_REG, >> + .reg_ext = RCA_VRD_PWR_MW_REG, >> + .label = "power5 RCA VRD" >> + }, >> +}; >> + >> +static int smpro_read_temp(struct device *dev, u32 attr, int channel, long *val) >> +{ >> + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); >> + unsigned int value; >> + int ret; >> + >> + switch (attr) { >> + case hwmon_temp_input: >> + ret = regmap_read(hwmon->regmap, >> + temperature[channel].reg, &value); >> + if (ret) >> + return ret; >> + *val = (value & 0x1ff) * 1000; >> + break; >> + case hwmon_temp_crit: >> + if (temperature[channel].reg == SOC_VRD_TEMP_REG) { >> + ret = regmap_read(hwmon->regmap, SOC_VR_HOT_THRESHOLD_REG, &value); >> + if (ret) >> + return ret; >> + *val = (value & 0x1ff) * 1000; >> + } else { >> + /* Report same MEM HOT threshold across DIMM channels */ >> + ret = regmap_read(hwmon->regmap, MEM_HOT_THRESHOLD_REG, &value); >> + if (ret) >> + return ret; >> + *val = (value & 0x1ff) * 1000; >> + } > > To avoid code duplication: > > reg = temperature[channel].reg == SOC_VRD_TEMP_REG ? SOC_VR_HOT_THRESHOLD_REG : MEM_HOT_THRESHOLD_REG; > ret = regmap_read(hwmon->regmap, reg, &value); > if (ret) > return ret; > > But then why don't you just use reg_ext to store SOC_VR_HOT_THRESHOLD_REG > or MEM_HOT_THRESHOLD_REG ? It is already available, after all, and with it > the code could be simplified to > > ret = regmap_read(hwmon->regmap, temperature[channel].reg_ext, &value); > if (ret) > return ret; > Thank you for the comment. Will change code follow this suggestion, will include in next version > I don't have a datasheet, but I do wonder what is in bit 9..15. Any idea ? > Main question is if there is a sign bit, as theoretic as it may be. > The original intention was to use this as 9-bit 2-complement value follow LM75, but the fact is that the operation temperature is 0-125 C degree, so we simply use it as-is. >> + break; >> + default: >> + return -EOPNOTSUPP; >> + } >> + return 0; >> +} >> + >> +static int smpro_read_in(struct device *dev, u32 attr, int channel, long *val) >> +{ >> + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); >> + unsigned int value; >> + int ret; >> + >> + switch (attr) { >> + case hwmon_in_input: >> + ret = regmap_read(hwmon->regmap, voltage[channel].reg, &value); >> + if (ret < 0) >> + return ret; >> + /* Scale reported by the hardware is 1mV */ >> + *val = value & 0x7fff; > > What is in bit 15 ? > This is 15-bit voltage in mV so the bit 15 (0-15) is unused. >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> +} >> + >> +static int smpro_read_curr(struct device *dev, u32 attr, int channel, long *val) >> +{ >> + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); >> + unsigned int value; >> + int ret; >> + >> + switch (attr) { >> + case hwmon_curr_input: >> + ret = regmap_read(hwmon->regmap, curr_sensor[channel].reg, &value); >> + if (ret < 0) >> + return ret; >> + /* Scale reported by the hardware is 1mA */ >> + *val = value & 0x7fff; >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> +} >> + >> +static int smpro_read_power(struct device *dev, u32 attr, int channel, long *val_pwr) >> +{ >> + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); >> + unsigned int val = 0, val_mw = 0; >> + int ret; >> + >> + switch (attr) { >> + case hwmon_power_input: >> + ret = regmap_read(hwmon->regmap, power[channel].reg, &val); >> + if (ret) >> + return ret; >> + >> + ret = regmap_read(hwmon->regmap, power[channel].reg_ext, &val_mw); >> + if (ret) >> + return ret; >> + >> + *val_pwr = val * 1000000 + val_mw * 1000; >> + return 0; >> + >> + default: >> + return -EOPNOTSUPP; >> + } >> +} >> + >> +static int smpro_read(struct device *dev, enum hwmon_sensor_types type, >> + u32 attr, int channel, long *val) >> +{ >> + switch (type) { >> + case hwmon_temp: >> + return smpro_read_temp(dev, attr, channel, val); >> + case hwmon_in: >> + return smpro_read_in(dev, attr, channel, val); >> + case hwmon_power: >> + return smpro_read_power(dev, attr, channel, val); >> + case hwmon_curr: >> + return smpro_read_curr(dev, attr, channel, val); >> + default: >> + return -EOPNOTSUPP; >> + } >> +} >> + >> +static int smpro_write(struct device *dev, enum hwmon_sensor_types type, >> + u32 attr, int channel, long val) >> +{ >> + return -EOPNOTSUPP; >> +} > > There are no writeable attributes, thus the write function is not needed. > Agree, will remove in next version >> + >> +static int smpro_read_string(struct device *dev, enum hwmon_sensor_types type, >> + u32 attr, int channel, const char **str) >> +{ >> + switch (type) { >> + case hwmon_temp: >> + switch (attr) { >> + case hwmon_temp_label: >> + *str = temperature[channel].label; >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> + break; >> + >> + case hwmon_in: >> + switch (attr) { >> + case hwmon_in_label: >> + *str = voltage[channel].label; >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> + break; >> + >> + case hwmon_curr: >> + switch (attr) { >> + case hwmon_curr_label: >> + *str = curr_sensor[channel].label; >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> + break; >> + >> + case hwmon_power: >> + switch (attr) { >> + case hwmon_power_label: >> + *str = power[channel].label; >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> + break; >> + default: >> + return -EOPNOTSUPP; >> + } >> + >> + return -EOPNOTSUPP; > > If you are returning -ENOPSUPP by default, might as well replace > all the same returns above with break; > Yes, will fix as you suggested. Will include in next version >> +} >> + >> +static umode_t smpro_is_visible(const void *data, enum hwmon_sensor_types type, >> + u32 attr, int channel) >> +{ >> + const struct smpro_hwmon *hwmon = data; >> + unsigned int value; >> + int ret; >> + >> + switch (type) { >> + case hwmon_temp: >> + switch (attr) { >> + case hwmon_temp_input: >> + case hwmon_temp_label: >> + case hwmon_temp_crit: >> + ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value); >> + if (ret || value == 0xFFFF) >> + return 0; >> + break; >> + } >> + default: >> + break; >> + } >> + >> + return 0444; >> +} >> + >> +static const struct hwmon_channel_info *smpro_info[] = { >> + HWMON_CHANNEL_INFO(temp, >> + HWMON_T_INPUT | HWMON_T_LABEL, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL, >> + HWMON_T_INPUT | HWMON_T_LABEL, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL), >> + HWMON_CHANNEL_INFO(in, >> + HWMON_I_INPUT | HWMON_I_LABEL, >> + HWMON_I_INPUT | HWMON_I_LABEL, >> + HWMON_I_INPUT | HWMON_I_LABEL, >> + HWMON_I_INPUT | HWMON_I_LABEL, >> + HWMON_I_INPUT | HWMON_I_LABEL), >> + HWMON_CHANNEL_INFO(power, >> + HWMON_P_INPUT | HWMON_P_LABEL, >> + HWMON_P_INPUT | HWMON_P_LABEL, >> + HWMON_P_INPUT | HWMON_P_LABEL, >> + HWMON_P_INPUT | HWMON_P_LABEL, >> + HWMON_P_INPUT | HWMON_P_LABEL), >> + HWMON_CHANNEL_INFO(curr, >> + HWMON_C_INPUT | HWMON_C_LABEL, >> + HWMON_C_INPUT | HWMON_C_LABEL, >> + HWMON_C_INPUT | HWMON_C_LABEL, >> + HWMON_C_INPUT | HWMON_C_LABEL, >> + HWMON_C_INPUT | HWMON_C_LABEL), >> + NULL >> +}; >> + >> +static const struct hwmon_ops smpro_hwmon_ops = { >> + .is_visible = smpro_is_visible, >> + .read = smpro_read, >> + .write = smpro_write, >> + .read_string = smpro_read_string, >> +}; >> + >> +static const struct hwmon_chip_info smpro_chip_info = { >> + .ops = &smpro_hwmon_ops, >> + .info = smpro_info, >> +}; >> + >> +static bool is_valid_id(struct regmap *regmap) >> +{ >> + unsigned int val; >> + int ret; >> + >> + ret = regmap_read(regmap, MANUFACTURER_ID_REG, &val); >> + >> + return (ret || (val != AMPERE_MANUFACTURER_ID)) ? false : true; > > I am quite concerned about this: The calling code will translate it to > -EPROBE_DEFER even if the manufacturer ID is wrong. It should return > -ENODEV in that case. There should be a better means to determine if the > controller is not available at all, or not yet. > Yes, I agree Will fix in next version: + if the regmap_read return error, return -EPROBE_DEFER + if manufacturer ID is wrong, return -ENODEV >> +} >> + >> +static int smpro_hwmon_probe(struct platform_device *pdev) >> +{ >> + struct smpro_hwmon *hwmon; >> + struct device *hwmon_dev; >> + >> + hwmon = devm_kzalloc(&pdev->dev, sizeof(struct smpro_hwmon), GFP_KERNEL); >> + if (!hwmon) >> + return -ENOMEM; >> + >> + hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL); >> + if (!hwmon->regmap) >> + return -ENODEV; >> + >> + /* Check for valid ID */ >> + if (!is_valid_id(hwmon->regmap)) >> + return -EPROBE_DEFER; >> + >> + hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "smpro_hwmon", >> + hwmon, &smpro_chip_info, NULL); >> + >> + return PTR_ERR_OR_ZERO(hwmon_dev); >> +} >> + >> +static const struct of_device_id smpro_hwmon_of_match[] = { >> + { .compatible = "ampere,ac01-hwmon" }, >> + {} >> +}; >> +MODULE_DEVICE_TABLE(of, smpro_hwmon_of_match); >> + >> +static struct platform_driver smpro_hwmon_driver = { >> + .probe = smpro_hwmon_probe, >> + .driver = { >> + .name = "smpro-hwmon", >> + .of_match_table = smpro_hwmon_of_match, >> + }, >> +}; >> + >> +module_platform_driver(smpro_hwmon_driver); >> + >> +MODULE_AUTHOR("Thu Nguyen <thu@os.amperecomputing.com>"); >> +MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>"); >> +MODULE_DESCRIPTION("Ampere Altra SMPro hwmon driver"); >> +MODULE_LICENSE("GPL v2"); >> >
On 4/7/21 12:41 AM, Quan Nguyen wrote: [ ... ] >> >> But then why don't you just use reg_ext to store SOC_VR_HOT_THRESHOLD_REG >> or MEM_HOT_THRESHOLD_REG ? It is already available, after all, and with it >> the code could be simplified to >> >> ret = regmap_read(hwmon->regmap, temperature[channel].reg_ext, &value); >> if (ret) >> return ret; >> > Thank you for the comment. > > Will change code follow this suggestion, will include in next version > >> I don't have a datasheet, but I do wonder what is in bit 9..15. Any idea ? >> Main question is if there is a sign bit, as theoretic as it may be. >> > The original intention was to use this as 9-bit 2-complement value follow LM75, but the fact is that the operation temperature is 0-125 C degree, so we simply use it as-is. > The operational temperature is not the question here. The question is if the chip _reports_ a sign. If it does, it should be handled, even if it is outside the operational range. The reported range is relevant here, not the operational range. After all, the chip won't really blow apart at -1 degrees C. Thanks, Guenter
On 07/04/2021 19:11, Guenter Roeck wrote: > On 4/7/21 12:41 AM, Quan Nguyen wrote: > [ ... ] >>> >>> But then why don't you just use reg_ext to store SOC_VR_HOT_THRESHOLD_REG >>> or MEM_HOT_THRESHOLD_REG ? It is already available, after all, and with it >>> the code could be simplified to >>> >>> ret = regmap_read(hwmon->regmap, temperature[channel].reg_ext, &value); >>> if (ret) >>> return ret; >>> >> Thank you for the comment. >> >> Will change code follow this suggestion, will include in next version >> >>> I don't have a datasheet, but I do wonder what is in bit 9..15. Any idea ? >>> Main question is if there is a sign bit, as theoretic as it may be. >>> >> The original intention was to use this as 9-bit 2-complement value follow LM75, but the fact is that the operation temperature is 0-125 C degree, so we simply use it as-is. >> > > The operational temperature is not the question here. The question is if the > chip _reports_ a sign. If it does, it should be handled, even if it is outside > the operational range. The reported range is relevant here, not the operational > range. After all, the chip won't really blow apart at -1 degrees C. > I think I've got it, will handle the sign bit in next version. -Quan
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 0ddc974b102e..ba4b5a911baf 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -67,6 +67,14 @@ config SENSORS_ABITUGURU3 This driver can also be built as a module. If so, the module will be called abituguru3. +config SENSORS_SMPRO + tristate "Ampere's Altra SMpro hardware monitoring driver" + depends on MFD_SMPRO + help + If you say yes here you get support for the thermal, voltage, + current and power sensors of Ampere's Altra processor family SoC + with SMpro co-processor. + config SENSORS_AD7314 tristate "Analog Devices AD7314 and compatibles" depends on SPI diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 59e78bc212cf..b25391f9c651 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -174,6 +174,7 @@ obj-$(CONFIG_SENSORS_SHT3x) += sht3x.o obj-$(CONFIG_SENSORS_SHTC1) += shtc1.o obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o obj-$(CONFIG_SENSORS_SMM665) += smm665.o +obj-$(CONFIG_SENSORS_SMPRO) += smpro-hwmon.o obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o diff --git a/drivers/hwmon/smpro-hwmon.c b/drivers/hwmon/smpro-hwmon.c new file mode 100644 index 000000000000..4277736ebc6e --- /dev/null +++ b/drivers/hwmon/smpro-hwmon.c @@ -0,0 +1,494 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Ampere Computing SoC's SMPro Hardware Monitoring Driver + * + * Copyright (c) 2021, Ampere Computing LLC + */ +#include <linux/bitfield.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/kernel.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/regmap.h> + +/* Identification Registers */ +#define MANUFACTURER_ID_REG 0x02 +#define AMPERE_MANUFACTURER_ID 0xCD3A + +/* Logical Power Sensor Registers */ +#define SOC_TEMP_REG 0x10 +#define SOC_VRD_TEMP_REG 0x11 +#define DIMM_VRD_TEMP_REG 0x12 +#define CORE_VRD_TEMP_REG 0x13 +#define CH0_DIMM_TEMP_REG 0x14 +#define CH1_DIMM_TEMP_REG 0x15 +#define CH2_DIMM_TEMP_REG 0x16 +#define CH3_DIMM_TEMP_REG 0x17 +#define CH4_DIMM_TEMP_REG 0x18 +#define CH5_DIMM_TEMP_REG 0x19 +#define CH6_DIMM_TEMP_REG 0x1A +#define CH7_DIMM_TEMP_REG 0x1B +#define RCA_VRD_TEMP_REG 0x1C + +#define CORE_VRD_PWR_REG 0x20 +#define SOC_PWR_REG 0x21 +#define DIMM_VRD1_PWR_REG 0x22 +#define DIMM_VRD2_PWR_REG 0x23 +#define CORE_VRD_PWR_MW_REG 0x26 +#define SOC_PWR_MW_REG 0x27 +#define DIMM_VRD1_PWR_MW_REG 0x28 +#define DIMM_VRD2_PWR_MW_REG 0x29 +#define RCA_VRD_PWR_REG 0x2A +#define RCA_VRD_PWR_MW_REG 0x2B + +#define MEM_HOT_THRESHOLD_REG 0x32 +#define SOC_VR_HOT_THRESHOLD_REG 0x33 +#define CORE_VRD_VOLT_REG 0x34 +#define SOC_VRD_VOLT_REG 0x35 +#define DIMM_VRD1_VOLT_REG 0x36 +#define DIMM_VRD2_VOLT_REG 0x37 +#define RCA_VRD_VOLT_REG 0x38 + +#define CORE_VRD_CURR_REG 0x39 +#define SOC_VRD_CURR_REG 0x3A +#define DIMM_VRD1_CURR_REG 0x3B +#define DIMM_VRD2_CURR_REG 0x3C +#define RCA_VRD_CURR_REG 0x3D + +struct smpro_hwmon { + struct regmap *regmap; +}; + +struct smpro_sensor { + const u8 reg; + const u8 reg_ext; + const char *label; +}; + +static const struct smpro_sensor temperature[] = { + { + .reg = SOC_TEMP_REG, + .label = "temp1 SoC" + }, + { + .reg = SOC_VRD_TEMP_REG, + .label = "temp2 SoC VRD" + }, + { + .reg = DIMM_VRD_TEMP_REG, + .label = "temp3 DIMM VRD" + }, + { + .reg = CORE_VRD_TEMP_REG, + .label = "temp4 CORE VRD" + }, + { + .reg = CH0_DIMM_TEMP_REG, + .label = "temp5 CH0 DIMM" + }, + { + .reg = CH1_DIMM_TEMP_REG, + .label = "temp6 CH1 DIMM" + }, + { + .reg = CH2_DIMM_TEMP_REG, + .label = "temp7 CH2 DIMM" + }, + { + .reg = CH3_DIMM_TEMP_REG, + .label = "temp8 CH3 DIMM" + }, + { + .reg = CH4_DIMM_TEMP_REG, + .label = "temp9 CH4 DIMM" + }, + { + .reg = CH5_DIMM_TEMP_REG, + .label = "temp10 CH5 DIMM" + }, + { + .reg = CH6_DIMM_TEMP_REG, + .label = "temp11 CH6 DIMM" + }, + { + .reg = CH7_DIMM_TEMP_REG, + .label = "temp12 CH7 DIMM" + }, + { + .reg = RCA_VRD_TEMP_REG, + .label = "temp13 RCA VRD" + }, +}; + +static const struct smpro_sensor voltage[] = { + { + .reg = CORE_VRD_VOLT_REG, + .label = "vout0 CORE VRD" + }, + { + .reg = SOC_VRD_VOLT_REG, + .label = "vout1 SoC VRD" + }, + { + .reg = DIMM_VRD1_VOLT_REG, + .label = "vout2 DIMM VRD1" + }, + { + .reg = DIMM_VRD2_VOLT_REG, + .label = "vout3 DIMM VRD2" + }, + { + .reg = RCA_VRD_VOLT_REG, + .label = "vout4 RCA VRD" + }, +}; + +static const struct smpro_sensor curr_sensor[] = { + { + .reg = CORE_VRD_CURR_REG, + .label = "iout1 CORE VRD" + }, + { + .reg = SOC_VRD_CURR_REG, + .label = "iout2 SoC VRD" + }, + { + .reg = DIMM_VRD1_CURR_REG, + .label = "iout3 DIMM VRD1" + }, + { + .reg = DIMM_VRD2_CURR_REG, + .label = "iout4 DIMM VRD2" + }, + { + .reg = RCA_VRD_CURR_REG, + .label = "iout5 RCA VRD" + }, +}; + +static const struct smpro_sensor power[] = { + { + .reg = CORE_VRD_PWR_REG, + .reg_ext = CORE_VRD_PWR_MW_REG, + .label = "power1 CORE VRD" + }, + { + .reg = SOC_PWR_REG, + .reg_ext = SOC_PWR_MW_REG, + .label = "power2 SoC" + }, + { + .reg = DIMM_VRD1_PWR_REG, + .reg_ext = DIMM_VRD1_PWR_MW_REG, + .label = "power3 DIMM VRD1" + }, + { + .reg = DIMM_VRD2_PWR_REG, + .reg_ext = DIMM_VRD2_PWR_MW_REG, + .label = "power4 DIMM VRD2" + }, + { + .reg = RCA_VRD_PWR_REG, + .reg_ext = RCA_VRD_PWR_MW_REG, + .label = "power5 RCA VRD" + }, +}; + +static int smpro_read_temp(struct device *dev, u32 attr, int channel, long *val) +{ + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); + unsigned int value; + int ret; + + switch (attr) { + case hwmon_temp_input: + ret = regmap_read(hwmon->regmap, + temperature[channel].reg, &value); + if (ret) + return ret; + *val = (value & 0x1ff) * 1000; + break; + case hwmon_temp_crit: + if (temperature[channel].reg == SOC_VRD_TEMP_REG) { + ret = regmap_read(hwmon->regmap, SOC_VR_HOT_THRESHOLD_REG, &value); + if (ret) + return ret; + *val = (value & 0x1ff) * 1000; + } else { + /* Report same MEM HOT threshold across DIMM channels */ + ret = regmap_read(hwmon->regmap, MEM_HOT_THRESHOLD_REG, &value); + if (ret) + return ret; + *val = (value & 0x1ff) * 1000; + } + break; + default: + return -EOPNOTSUPP; + } + return 0; +} + +static int smpro_read_in(struct device *dev, u32 attr, int channel, long *val) +{ + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); + unsigned int value; + int ret; + + switch (attr) { + case hwmon_in_input: + ret = regmap_read(hwmon->regmap, voltage[channel].reg, &value); + if (ret < 0) + return ret; + /* Scale reported by the hardware is 1mV */ + *val = value & 0x7fff; + return 0; + default: + return -EOPNOTSUPP; + } +} + +static int smpro_read_curr(struct device *dev, u32 attr, int channel, long *val) +{ + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); + unsigned int value; + int ret; + + switch (attr) { + case hwmon_curr_input: + ret = regmap_read(hwmon->regmap, curr_sensor[channel].reg, &value); + if (ret < 0) + return ret; + /* Scale reported by the hardware is 1mA */ + *val = value & 0x7fff; + return 0; + default: + return -EOPNOTSUPP; + } +} + +static int smpro_read_power(struct device *dev, u32 attr, int channel, long *val_pwr) +{ + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); + unsigned int val = 0, val_mw = 0; + int ret; + + switch (attr) { + case hwmon_power_input: + ret = regmap_read(hwmon->regmap, power[channel].reg, &val); + if (ret) + return ret; + + ret = regmap_read(hwmon->regmap, power[channel].reg_ext, &val_mw); + if (ret) + return ret; + + *val_pwr = val * 1000000 + val_mw * 1000; + return 0; + + default: + return -EOPNOTSUPP; + } +} + +static int smpro_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + switch (type) { + case hwmon_temp: + return smpro_read_temp(dev, attr, channel, val); + case hwmon_in: + return smpro_read_in(dev, attr, channel, val); + case hwmon_power: + return smpro_read_power(dev, attr, channel, val); + case hwmon_curr: + return smpro_read_curr(dev, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static int smpro_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + return -EOPNOTSUPP; +} + +static int smpro_read_string(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, const char **str) +{ + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp_label: + *str = temperature[channel].label; + return 0; + default: + return -EOPNOTSUPP; + } + break; + + case hwmon_in: + switch (attr) { + case hwmon_in_label: + *str = voltage[channel].label; + return 0; + default: + return -EOPNOTSUPP; + } + break; + + case hwmon_curr: + switch (attr) { + case hwmon_curr_label: + *str = curr_sensor[channel].label; + return 0; + default: + return -EOPNOTSUPP; + } + break; + + case hwmon_power: + switch (attr) { + case hwmon_power_label: + *str = power[channel].label; + return 0; + default: + return -EOPNOTSUPP; + } + break; + default: + return -EOPNOTSUPP; + } + + return -EOPNOTSUPP; +} + +static umode_t smpro_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + const struct smpro_hwmon *hwmon = data; + unsigned int value; + int ret; + + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp_input: + case hwmon_temp_label: + case hwmon_temp_crit: + ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value); + if (ret || value == 0xFFFF) + return 0; + break; + } + default: + break; + } + + return 0444; +} + +static const struct hwmon_channel_info *smpro_info[] = { + HWMON_CHANNEL_INFO(temp, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, + HWMON_T_INPUT | HWMON_T_LABEL), + HWMON_CHANNEL_INFO(in, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL), + HWMON_CHANNEL_INFO(power, + HWMON_P_INPUT | HWMON_P_LABEL, + HWMON_P_INPUT | HWMON_P_LABEL, + HWMON_P_INPUT | HWMON_P_LABEL, + HWMON_P_INPUT | HWMON_P_LABEL, + HWMON_P_INPUT | HWMON_P_LABEL), + HWMON_CHANNEL_INFO(curr, + HWMON_C_INPUT | HWMON_C_LABEL, + HWMON_C_INPUT | HWMON_C_LABEL, + HWMON_C_INPUT | HWMON_C_LABEL, + HWMON_C_INPUT | HWMON_C_LABEL, + HWMON_C_INPUT | HWMON_C_LABEL), + NULL +}; + +static const struct hwmon_ops smpro_hwmon_ops = { + .is_visible = smpro_is_visible, + .read = smpro_read, + .write = smpro_write, + .read_string = smpro_read_string, +}; + +static const struct hwmon_chip_info smpro_chip_info = { + .ops = &smpro_hwmon_ops, + .info = smpro_info, +}; + +static bool is_valid_id(struct regmap *regmap) +{ + unsigned int val; + int ret; + + ret = regmap_read(regmap, MANUFACTURER_ID_REG, &val); + + return (ret || (val != AMPERE_MANUFACTURER_ID)) ? false : true; +} + +static int smpro_hwmon_probe(struct platform_device *pdev) +{ + struct smpro_hwmon *hwmon; + struct device *hwmon_dev; + + hwmon = devm_kzalloc(&pdev->dev, sizeof(struct smpro_hwmon), GFP_KERNEL); + if (!hwmon) + return -ENOMEM; + + hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!hwmon->regmap) + return -ENODEV; + + /* Check for valid ID */ + if (!is_valid_id(hwmon->regmap)) + return -EPROBE_DEFER; + + hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "smpro_hwmon", + hwmon, &smpro_chip_info, NULL); + + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct of_device_id smpro_hwmon_of_match[] = { + { .compatible = "ampere,ac01-hwmon" }, + {} +}; +MODULE_DEVICE_TABLE(of, smpro_hwmon_of_match); + +static struct platform_driver smpro_hwmon_driver = { + .probe = smpro_hwmon_probe, + .driver = { + .name = "smpro-hwmon", + .of_match_table = smpro_hwmon_of_match, + }, +}; + +module_platform_driver(smpro_hwmon_driver); + +MODULE_AUTHOR("Thu Nguyen <thu@os.amperecomputing.com>"); +MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>"); +MODULE_DESCRIPTION("Ampere Altra SMPro hwmon driver"); +MODULE_LICENSE("GPL v2");
This commit adds support for Ampere SMpro hwmon driver. This driver supports accessing various CPU sensors provided by the SMpro co-processor including temperature, power, voltages, and current. Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com> --- drivers/hwmon/Kconfig | 8 + drivers/hwmon/Makefile | 1 + drivers/hwmon/smpro-hwmon.c | 494 ++++++++++++++++++++++++++++++++++++ 3 files changed, 503 insertions(+) create mode 100644 drivers/hwmon/smpro-hwmon.c